History
Rig Veda – 800-600 BC
Ain-e-Akbari – Mughal King Akbar (16th Century)
1872 – the first systematic Census conducted all over India
(non synchronous)
1881 – the first synchronous Census conducted all over India
1951 – the first Census of Independent India
2011 – the 15th since 1872
– the 7th since Independence